直接上代码

//小程序端
async getUserInfo() {
    const that = this
    if (that.globalData.userInfo) {
      return that.globalData.userInfo
    }
    var reqLogin = await wepy.login(),
      reqGetUserInfo = await wepy.getUserInfo(),
      userInfo = reqGetUserInfo.userInfo
    console.log('reqLogin',reqLogin)
    console.log('reqGetUserInfo',reqGetUserInfo)

    var reqOnlogin = await wepy.request({url: `${that.globalData.api.gicWechat}/base/onlogin?weappcode=${reqLogin.code}`}),
      json = reqOnlogin.data
    console.log('reqOnlogin',reqOnlogin)

    if (json.data && json.data.body && json.data.body.sessionKey) {
      var pc = new WXBizDataCrypt(Config.weAppId, json.data.body.sessionKey),
        userInfo = pc.decryptData(reqGetUserInfo.encryptedData , reqGetUserInfo.iv)
    } else {
      console.warn('json.data.body',json.data.body)
    }
    
    console.log('userInfo',userInfo)
    return that.globalData.userInfo = userInfo
  }

//服务器端
exports.onlogin = function *(next){
    log(logger, `/base/onlogin => onlogin` ,this)

    var code = this.query.weappcode

    var res = yield superagent.get(`https://api.weixin.qq.com/sns/jscode2session?appid=${wechatOpts.appId}&secret=${wechatOpts.appSecret}&js_code=${code}&grant_type=authorization_code`)
    var body 
    if (res.text) {
        body = JSON.parse(res.text)
    }
    logger.debug(`res: ${JSON.stringify(res)}`)

     yield this.body = {
            data:{
                body : body,
                success : true
            },
            status:{
                code : 1,
                msg  : 'success'
            }
        }
}

服务器端的 结果一直是invalid code ， 求大神指导